Brewery Glycol Chiller & Cellar Cooling Load Calculator
Size commercial brewery chillers, propylene glycol reservoirs, and cellar pump flow rates across fermentation holding, cold crashing, and wort knockout.
Cellar Fermentation Capacity
Crashing & Knockout Demands
Chiller Sizing Recommendation
Load Breakdown
Recommended Tools & Equipment
Tested hardware and components for high reliability
Engineering Fundamentals: Sizing Brewery Glycol Chillers
A brewery refrigeration plant must simultaneously satisfy three thermal loads: holding active fermentation temperatures, crashing finished beer from ale temperatures (~68°F) to conditioning temperatures (~33°F), and holding bright tanks while rejecting ambient cellar heat gains.
1. Active Fermentation Heat Generation
Yeast metabolism is intensely exothermic, generating approximately 280 BTU per hour per barrel (BBL) during peak high krausen. Maintaining steady temperature requires continuous removal of this metabolic energy:
Q_ferm = N_active_FVs × BBL × 280 (BTU/hr)
2. Cold Crashing Duty
Crashing a tank to flocculate yeast and precipitate chill haze creates the largest instantaneous load in the cellar:
Q_crash = [ BBL × 31 gal/BBL × 8.34 lb/gal × 1.0 BTU/lb·°F × (T_start - T_crash) ] / Hours_crash- For a 30 BBL tank pulled from 68°F to 33°F in 24 hours:
Q_crash ≈ 11,310 BTU/hr.
3. Glycol Reservoir Sizing & Propylene Glycol Concentration
A thermal buffer reservoir prevents chiller compressor short-cycling. A minimum of 10 to 15 gallons of reservoir volume per ton of chiller capacity is recommended. Breweries must use uninhibited or food-grade inhibited propylene glycol at 33% to 35% concentration by volume (freeze protection to +5°F / burst protection to -20°F) at a 27°F to 28°F supply loop setpoint.
Frequently Asked Questions
What is the standard glycol concentration for brewery chilling loops?
Commercial breweries use food-grade inhibited propylene glycol mixed to 33% to 35% concentration by volume with reverse osmosis or deionized water. This provides freeze protection down to +5°F (-15°C) and burst protection down to -20°F, ideal for a 27°F to 28°F supply loop.
Why should automotive ethylene glycol never be used in a brewery?
Ethylene glycol is toxic and strictly prohibited in food and beverage facilities. Propylene glycol (USP / food-grade) is non-toxic (GRAS) and prevents lethal product contamination in the event of an internal cooling jacket weld fracture.
How does cold crashing affect chiller sizing compared to fermentation holding?
Cold crashing pulls beer from 68°F down to 33°F within 24 to 36 hours, creating an instantaneous thermal load that is typically 3 to 4 times higher per barrel than steady fermentation holding. Peak crashing requirements dictate the minimum chiller tonnage.
What is the purpose of an insulated glycol reservoir tank?
A glycol reservoir acts as a thermal flywheel. It stores chilled thermal mass so short spikes in demand (e.g., kicking on a crash cycle) do not cause chiller compressors to short-cycle or cellar supply temperatures to surge.